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CVE-2026-56705

CriticalPublished

Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection

Published: Aug 25, 2026
Updated: Aug 25, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 26, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthenticated attackers to inject ODBC parameters via semicolons. Attackers can inject TraceFile and TraceOn parameters to write PHP code to the web root, achieving remote code execution when the trace file is accessed.

Sources

CVE-2026-56705Exploit
PoC exploit for Adminer < 5.4.3 unauthenticated RCE via MSSQL PDO DSN injection, including Docker lab and negative test.
Exploit-CVE-2026-56705Exploit
CVE-2026-56705 — Adminer < 5.4.3 Unauthenticated RCE via MSSQL PDO DSN Injection

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